Cita APA (7a ed.)

Boulenger, E. G., & Brightwell, L. R. (1927). Animal mysteries. Duckworth.

Cita Chicago Style (17a ed.)

Boulenger, E. G., y L. R. Brightwell. Animal Mysteries. London: Duckworth, 1927.

Cita MLA (9a ed.)

Boulenger, E. G., y L. R. Brightwell. Animal Mysteries. Duckworth, 1927.